GB547377A - Improvements in and relating to electric circuit interrupting devices - Google Patents

Improvements in and relating to electric circuit interrupting devices

Info

Publication number
GB547377A
GB547377A GB9436/41A GB943641A GB547377A GB 547377 A GB547377 A GB 547377A GB 9436/41 A GB9436/41 A GB 9436/41A GB 943641 A GB943641 A GB 943641A GB 547377 A GB547377 A GB 547377A
Authority
GB
United Kingdom
Prior art keywords
portions
central
fuse
wing
july
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB9436/41A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to US347437A priority Critical patent/US2294132A/en
Application filed by British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Publication of GB547377A publication Critical patent/GB547377A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02Details
    • H01H85/04Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/041Fuses, i.e. expendable parts of the protective device, e.g. cartridges characterised by the type
    • H01H85/042General constructions or structure of high voltage fuses, i.e. above 1000 V
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02Details
    • H01H85/04Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/05Component parts thereof
    • H01H85/055Fusible members
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02Details
    • H01H85/04Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/05Component parts thereof
    • H01H85/055Fusible members
    • H01H85/06Fusible members characterised by the fusible material

Abstract

547,377. Fusible cut-outs ; binding-posts. BRITISH THOMSON-HOUSTON CO., Ltd. July 25, 1941, No. 9436. Convention date, July 25, 1940. [Class 38 (i)] A high-voltage fuse with a long fusible element embedded in arc-quenching material has the central portion of the element made of a metal having a higher resistance than the end portions so as to fuse first and thus limit the magnitude of the voltage surge caused by the sudden checking of the shortcircuit current. The end portions 30 of the element may be of silver and the central part 31 of a nickelchromium-iron alloy. This has a high temperaturecoefficient and limits the rise of current before fusion. The element is wound on a core 24 of cross-shaped section, the ends being secured to sheet metal terminals, Figs. 5 and 10, the tongue N being folded up at n and welded to the part M and to the wire 25 at W. The part M is then placed across the angle between two fins of the core and the part P is bent round the edge of one wing, the part S being then bent down over the end of the wing. The part T is welded or soldered to the cap 21 of the fuse. The central part of the element may have ceramic beads threaded on it to retain the heat at low overloads, and the two end portions may be of different gauge wire so that fusion takes place in three stages. Where an element of increased cross section is required several fine wires are used in parallel.
GB9436/41A 1940-07-25 1941-07-25 Improvements in and relating to electric circuit interrupting devices Expired GB547377A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US347437A US2294132A (en) 1940-07-25 1940-07-25 Electric circuit interrupting device

Publications (1)

Publication Number Publication Date
GB547377A true GB547377A (en) 1942-08-25

Family

ID=23363691

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9436/41A Expired GB547377A (en) 1940-07-25 1941-07-25 Improvements in and relating to electric circuit interrupting devices

Country Status (5)

Country Link
US (1) US2294132A (en)
BE (1) BE450677A (en)
DE (1) DE900849C (en)
FR (1) FR51777E (en)
GB (1) GB547377A (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2483577A (en) * 1943-11-24 1949-10-04 Westinghouse Electric Corp Circuit interrupter
US2417268A (en) * 1944-06-03 1947-03-11 Gen Electric Indicating means for thermal circuit interrupters
US2442216A (en) * 1944-06-09 1948-05-25 Gen Electric Electric fuse and indicator
US2435472A (en) * 1944-11-17 1948-02-03 Gen Electric Circuit interrupting device
US2551830A (en) * 1948-04-28 1951-05-08 Mcgraw Electric Co Fuse construction
US2873327A (en) * 1956-04-19 1959-02-10 Bernstein Elliot Combined fuse and current limiting resistor
US3222479A (en) * 1961-01-05 1965-12-07 Overseas Finance And Trading C High voltage current limiting fuse
US3113193A (en) * 1962-04-26 1963-12-03 Chase Shawmut Co Electric striker pin fuses for elevated circuit voltages
US3810062A (en) * 1972-05-04 1974-05-07 Chase Shawmut Co High-voltage fuse having full range clearing ability

Also Published As

Publication number Publication date
BE450677A (en)
FR51777E (en) 1943-05-03
DE900849C (en) 1954-01-04
US2294132A (en) 1942-08-25

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